Occurs when the value of the BackgroundImage property changes.
Assembly: System.Windows.Forms (in System.Windows.Forms.dll)
The following code example is an event handler that is executed when the Text property value changes. The Control class has several methods with the name pattern PropertyName Changed that are raised when the corresponding PropertyName value changes (PropertyName represents the name of the corresponding property).
The following code example changes the ForeColor of a TextBox displaying currency data. The example converts the text to a decimal number and changes the ForeColor to Color.Red if the number is negative and to Color.Black if the number is positive. This example requires that you have a Form that contains a TextBox.
Private Sub currencyTextBox_TextChanged(sender As Object, _ e As EventArgs) Handles currencyTextBox.TextChanged Try ' Convert the text to a Double and determine if it is a negative number. If Double.Parse(currencyTextBox.Text) < 0 Then ' If the number is negative, display it in Red. currencyTextBox.ForeColor = Color.Red Else ' If the number is not negative, display it in Black. currencyTextBox.ForeColor = Color.Black End If Catch ' If there is an error, display the text using the system colors. currencyTextBox.ForeColor = SystemColors.ControlText End Try End Sub